KR100840934B1 - Brightness enhanced light guided panel and liquid crystal display device using the same - Google Patents

Abstract

A luminance enhanced light guide plate and a liquid crystal display device using the same are disclosed. Brightness enhancement grooves are formed on the surface where the light incident from the outside is reflected to improve the optical distribution, change the optical path, and enhance the brightness. Minimize the area of the non-reflective groove surface. This has a variety of effects that can improve the brightness required for the display, the optical path change, the optical distribution.

LCD, Brightness Enhancement, LGP

Description

Brightness-enhancing light guide plate and liquid crystal display device using the same {{BRIGHTNESS ENHANCED LIGHT GUIDED PANEL AND LIQUID CRYSTAL DISPLAY DEVICE USING THE SAME}

1 is a conceptual diagram illustrating an optical distribution change function of a brightness-enhanced light guide plate according to an embodiment of the present invention.

2 is a conceptual diagram illustrating a brightness enhancing LGP and a lamp according to an exemplary embodiment of the present invention.

3 is a side view of the brightness enhancing LGP according to an exemplary embodiment of the present invention.

4 is an enlarged view illustrating an enlarged luminance enhancing groove of portion A of FIG. 3.

5 is a perspective view illustrating a luminance enhancement groove formed in the luminance enhancement LGP according to an exemplary embodiment of the present invention.

FIG. 6 is a cross-sectional view taken along the line VV of FIG. 5.

7 is a perspective view illustrating a luminance enhancement groove formed in the luminance enhancement LGP according to another exemplary embodiment of the present disclosure.

FIG. 8 is a VIII-VIII cross-sectional view of FIG. 7.

9 is a perspective view illustrating a luminance enhancement groove formed in the luminance enhancement LGP according to another exemplary embodiment of the present invention.

10 is an exploded perspective view of a liquid crystal display device to which a luminance enhanced LGP is applied according to an exemplary embodiment of the present invention.

The present invention relates to a brightness-enhancing light guide plate and a liquid crystal display device employing the same. More particularly, the optical distribution focused on a narrow area has a uniform optical distribution over a large area, and the display performance is enhanced by enhancing the brightness required for the display. The present invention relates to a luminance-enhanced light guide plate further improved and a liquid crystal display device using the same.

In general, a liquid crystal display device (LCD) displays an image by using an electro-optical characteristic of a liquid crystal (LC) having an intermediate physical property between a crystal and a liquid. It can be defined as one of the display devices.

Here, the electro-optical characteristic of the liquid crystal means that when an electric field is formed in the liquid crystal, the arrangement of the liquid crystal is changed so that the amount of light passing through the liquid crystal is changed.

Liquid crystals having such characteristics cannot generate light by themselves, and thus, in order to perform display on a liquid crystal display device, a technology for producing light that can pass through the liquid crystal, together with a technology for precisely controlling the liquid crystal in small area units in need.

Specifically, the technology for precisely controlling the liquid crystal is implemented by a "thin film transistor" manufactured by a semiconductor manufacturing process with a very small size and a "transparent electrode" having high transparency and transparent light as well as conductivity.                         

In addition, the technology for producing light to pass through the liquid crystal to achieve the display is implemented by a "backlight assembly". In this case, since the display by the liquid crystal display is formed in a plane shape, the backlight assembly should generate artificial light having a very uniform optical distribution while the optical distribution has a plane shape.

However, all of the artificial light sources except for the sunlight have a point light source or a linear light source, and such point light sources or linear light sources have a common point that a sudden brightness change occurs as a distance change is generated from the light source.

After all, it means that the point light source or the line light source is very difficult to be applied to the liquid crystal display without the processing of light.

Recently, in order to overcome such problems, a technology for changing a point light source or a line light source into a surface light source has been developed. As such, in order to change a point light source or a line light source into a surface light source type, a light guide panel (LGP) is generally used.

The light guide plate may be formed in, for example, a rectangular parallelepiped shape, and light incident from the side surface of the light guide plate is reflected on the bottom surface and is emitted while being widely spread. That is, the light guide plate improves the optical distribution and at the same time serves to change the direction of light. In this case, a reflective dot made of a reflective material having excellent reflectance is formed on the bottom surface of the light guide plate to increase the reflection efficiency of the light.

In this case, since the reflective dot is manufactured by a method such as a silk screen, a decrease in light reflection efficiency due to a shape defect of the reflective dot may occur in the manufacturing process. In addition, the reflective dot formed by a method such as a silk screen has a problem that it is difficult to produce below a certain size.

For this reason, the development of a brightness enhancement technology and a light guide plate technology that can perform a high brightness display while replacing the reflective dot has been urgently required in recent years.

Accordingly, the present invention has been made in view of such a conventional development demand, and a first object of the present invention is to provide a luminance-enhanced light guide plate capable of high luminance display by increasing the utilization efficiency of light generated from a light source.

It is a second object of the present invention to provide a liquid crystal display including a brightness enhancing light guide plate capable of high brightness display by increasing the utilization efficiency of light generated from a light source.

The luminance-enhanced light guide plate for implementing the first object of the present invention is formed so as to be adjacent to the light incident surface, the light incident surface to which the light is incident, the light output is emitted to face the bottom surface, the bottom surface to reflect the light Surface, a reflective groove surface facing the light incident surface and having a first inclination with respect to the bottom surface to reflect light toward the light exit surface, a non-reflective groove surface connected to the reflective groove surface and formed with a second slope with respect to the bottom surface And a brightness enhancement groove having a shape, wherein the second slope of the non-reflective groove surface is less than the first slope of the reflective groove surface.

In addition, a liquid crystal display including a brightness-enhancing light guide plate for implementing the second object of the present invention is formed so as to be adjacent to the light incident surface, the light incident surface to which the light is incident, opposing the bottom surface, the light incident surface to reflect the light And a reflection groove surface formed to have a first slope with respect to the bottom surface to reflect light toward the light exit surface, and a luminance enhancement groove having a non-reflection groove surface connected to the end of the reflection groove surface and formed to have a second slope with respect to the bottom surface. Wherein the second slope of the non-reflective groove surface is less than the first slope of the reflective groove surface, the backlight assembly comprising an optical distribution changing means for equalizing the optical distribution of the light emitted from the brightness enhancement light guide plate and the light generated from the backlight assembly. It includes a liquid crystal display panel assembly that precisely controls the amount of light to display an image. It is.

Hereinafter, a more specific configuration, operations and effects of the configuration of the luminance-enhanced light guide plate and the liquid crystal display device using the same according to an embodiment of the present invention will be described with reference to the accompanying drawings.

Referring to FIG. 1, the term “light guide plate 110” which is frequently used in the present invention is defined as an optical distribution changing device that changes an optical distribution concentrated on a narrow area to have a uniform optical distribution over a large area.

The light guide plate 110 defined as described above has a rectangular parallelepiped shape in one embodiment as shown in FIG. 2. More specifically, the light guide plate 110 has a rectangular parallelepiped shape consisting of four side surfaces, an upper surface, and a lower surface.

The light guide plate 110 is supplied with light to any one of the four side surfaces, and the path and optical distribution of the supplied light are changed on any one of the upper and lower surfaces, and the optical distribution and the path of the light are changed on the other of the upper and lower surfaces. The light is emitted.

Hereinafter, the side from which the light is supplied among the four side surfaces of the light guide plate 110 will be specifically defined as a light incident surface 114, and the surface that changes the path and optical distribution of light supplied from the light incident surface 114 will be described. The reflective surface 116 (see FIG. 1) will be defined, and the surface from which light is emitted will be defined as the light emitting surface 112.

The performance of the light guide plate 110 having such a shape is determined by the luminance uniformity of the light emitted from the light exit surface 112 and the intensity of the brightness.

In this case, various methods are used to improve the uniformity of the light and to enhance the intensity of the light, which influence the performance of the light guide plate 110. However, in the present invention, the light of the light guide plate 110 is shown in FIG. A method of changing the shape of the reflective surface 116 is used.

Specifically, grooves recessed from the surface are formed in the light reflection surface 116 of the light guide plate 110 in order to improve brightness uniformity of light and to enhance intensity of brightness.

In this case, the groove may have a dot shape or a groove shape. At this time, it should be noted that simply forming an arbitrary groove in the light reflecting surface 116 does not necessarily obtain a luminance improvement effect. Rather, it may be possible to obtain a luminance lower than that of the light generated from the light source due to the shape of the inappropriate groove.

This means that the shape of the groove formed on the light reflecting surface 116 has a great influence on the luminance distribution and the intensity of the luminance, and furthermore, by means of changing the shape of the groove reasonably, it is possible to obtain a much improved luminance.                     

Hereinafter, the luminance improvement in the light guide plate 110 by rationalizing the shape of the groove will be described.

In general, grooves that may be considered for application to the light reflecting surface 116 in order to improve luminance may have a conical shape or a symmetrical polygonal shape inward from the surface of the light reflecting surface 116. At this time, the groove of the polygonal shape means a groove having three or more sides.

Such simple and general grooves can of course improve the brightness somewhat, but are still insufficient to achieve maximum brightness. This is because only a part of the total area of the groove recessed from the light reflecting surface 116 reflects light.

Specifically, when the groove recessed from the light reflecting surface 116 has at least one side number as a cylinder or at least three side surfaces as a triangular pyramid in one embodiment, referring to FIG. 3, the light is incident in any direction. Even if the light only reaches a part of the groove. This is because the grooves do not have a planar configuration but have a spatial configuration.

After all, the fact that the light is reflected only on a portion of the side surface of the groove means that as the area occupied by the portion where the light is not reflected increases, the area of the portion reflecting the light decreases.

In the present invention, it is used. Specifically, the area of the portion where the light is not reflected is minimized among the side surfaces forming the groove so that the area of the portion where the light is reflected is maximized.

Hereinafter, it will be described in detail how it can be implemented.

First, in order to make the description clear, the part which has been described as "home" in the past will be clearly defined.

First, any portion of the side of the groove where light reaches and is capable of reflecting light will be specifically defined as a "reflection surface", and the remaining portion of the side of the groove where the light does not reach the "non-reflective surface ( "non-reflection surface".

In this case, in order to maximize the luminance, the area of the reflective surface of the groove is maximized, and the area of the non-reflective surface is minimized. Hereinafter, in the present invention, a groove in which the area of the reflective surface is maximized and the area of the non-reflective surface is minimized will be defined as "brightness-enhanced groove".

In this case, the luminance enhancement groove may have a groove shape or a recess shape.

3 or 4, the reflective surface 117 of the luminance enhancement groove 119 has a first slope θ1 with respect to the defined light reflective surface 116.

At this time, the direction of the first inclination is to be directed toward the light exit surface 112 after the light generated from the lamp 100 is incident through the light incident surface 114 of the light guide plate 110 and then reflected by the reflective surface 117 Get directions.

On the other hand, the non-reflective surface 118 of the brightness enhancement groove 119 is connected to the end of the reflective surface 117 and extends to the light reflective surface 116.                     

In this case, the second inclination θ2 between the non-reflective surface 118 and the light reflective surface 116 is very important based on the light reflective surface 116. This is because the total amount of light reflected by the reflective surface 117 is changed according to the second slope of the non-reflective surface 118.

Specifically, the non-reflective surface 118 is reflected from the reflective surface 117 perpendicular to the light reflective surface 116, that is, when the second slope is 90 ° based on the light reflective surface 116. The total amount of light is the largest.

This is because as the second slope of the non-reflective surface 118 becomes smaller than 90 ° while the height h of the luminance enhancement groove 119 is constant, the area occupied by one luminance enhancement groove 119 becomes larger and eventually has a limited area. This is because the number of brightness enhancement grooves 119 that can be formed in the reflective surface 116 is reduced. Decreased brightness enhancement groove 119 means that the total area of reflective surface 117 is reduced, which in turn means reduced brightness.

However, the increase in luminance is maximized when the non-reflective surface 118 of the brightness enhancement groove 119 is perpendicular to the light reflective surface 116. On the other hand, even if the non-reflective surface 118 does not form a right angle with respect to the light reflective surface 116, the effect of increasing the brightness to some extent can be obtained.

However, when the second inclination between the non-reflective surface 118 and the light reflective surface 116 is gradually lowered to reach an extreme value, the area occupied by one brightness enhancement groove 119 becomes large, and thus the luminance may be reduced.

This means that the range of the second slope of the optimized non-reflective surface 118 should be set. In the present invention, the second inclination θ2 between the non-reflection surface 118 and the light reflection surface 116 is set based on the first inclination between the reflection surface 117 and the light reflection surface 116.                     

Specifically, the second inclination θ2 is greater than the minimum first inclination θ1 and is at most 90 °. At this time, the first slope is optimized to reflect the light as much as possible.

For example, when the first slope of the reflective surface 117 is 45 °, the second slope of the non-reflective surface 118 may have a maximum of 90 ° from an angle greater than at least 45 °.

5 or 6 shows a specific embodiment of the brightness enhancement groove 119a according to an embodiment of the present invention.

5 and 6, the brightness enhancement grooves 119a have a conical shape. Therefore, if light is supplied from A to B direction, light reaches 117a of FIG. 5 and light does not reach the hatched area. As such, the brightness enhancement grooves 119a are divided into the reflective surface 117a and the non-reflective surface 118a according to whether the light arrives.

Thereafter, as described above, only the reflective surface 117a, which is a portion where light is projected and reflected in the cone, is left so that the second inclination between the non-reflective surface 118a and the light reflective surface 116 is maximized.

At this time, most preferably, as shown in FIG. 6, the second inclination between the non-reflective surface 118a and the light reflective surface 116 is at a maximum right angle, and at least the second slope of the non-reflective surface 118a is It is preferable to make it larger than the 1st inclination (theta) 1 which the reflection surface 117a and the light reflection surface 116 make.

On the other hand, the luminance enhancement groove may have a polygonal pyramid shape as shown in FIG. 7 or 8 in addition to the cone shape as shown in FIG. 5 or 6.                     

7 or 8, a brightness enhancement groove 119b having a pentagonal pyramid shape having four side surfaces and one bottom surface is formed in the light reflection surface 116. Of course, as described above, the luminance enhancement groove 119b is perpendicular to the second inclination between the non-reflective surface 118d and the light reflective surface 116. That is, the second slope is 90 degrees. Of course, the second inclination is at least greater than the first inclination θ1 formed between the reflecting surface 117b and the light reflecting surface 116.

In addition, the brightness enhancement groove may have a wide variety of modifications. For example, in FIG. 9, the luminance enhancement groove 119c is formed from the light reflection surface 116 at the end of the groove-shaped reflection surface 117c formed to have a first inclination θ1 from the light reflection surface 116. A non-reflective surface 118g having a groove shape is formed to have two inclinations θ2.

At this time, the second inclination of the non-reflective surface 118g is larger than the first inclination of the minimum reflective surface 117c and perpendicular to the maximum light reflecting surface 116 so that the number of the brightness enhancement grooves 119c is maximized. In addition, the area of the reflective surface 117c is maximized to improve display performance.

The luminance-enhanced groove is finally divided into a reflective surface and a non-reflective surface regardless of the shape of the luminance-enhanced groove including the embodiments described above. As a result, the luminance-enhanced groove formed in the groove shape on the light reflecting surface 116 of the light guide plate 110 may obtain a luminance improvement effect by adjusting the inclination of the non-reflective surface even if the groove shape is different.

FIG. 10 is an exploded perspective view of the liquid crystal display device to which the brightness enhanced LGP according to an embodiment of the present invention is applied.                     

The liquid crystal display 600 shown in FIG. 10 displays an image by precisely controlling a liquid crystal (LC).

Specifically, the liquid crystal has an elongated rod-shaped molecular shape, has an intermediate physical property between a crystal and a liquid, has optical properties with different light transmittances depending on the arrangement position, and can control the arrangement position according to an electric field. Has electrical properties.

In order to display an image by controlling a liquid crystal having physical and electro-optical characteristics, the liquid crystal display device 600 is largely divided into a liquid crystal display panel assembly 300, a backlight assembly 200, a case 510 and 520, and a chassis 400. Divided into

The liquid crystal display panel assembly 300 applies a precise electrical signal to the liquid crystal display panel 330 and the liquid crystal display panel 330 at a predetermined timing so as to individually control the liquid crystal layer having a thickness of only a few μm in units of small areas. It consists of a drive module (340, 350, 360, 370).

More specifically, in order to control the liquid crystal in small area units, a very small power supply control device is required as well as a transparent electrode.

A very small power supply control device can be implemented by a recently developed thin film transistor, and a transparent electrode can be made by an indium tin oxide thin film based on an oxide film.

More specifically, thin film transistors having a very small size in a matrix form are formed on a transparent substrate by a semiconductor thin film process. At this time, the gate electrodes of the thin film transistors belonging to each row of all the thin film transistors are commonly connected by the gate lines.

In addition, the source electrodes of the thin film transistors belonging to each column are commonly connected by data lines. Of course, the data lines intersect with the gate lines but do not short together.

Meanwhile, in the drain electrodes of all the thin film transistors, the pixel electrode made of indium tin oxide material described above is formed in a predetermined area.

As described above, the data line, the gate line, the thin film transistor, and the indium tin oxide thin film are formed on the glass substrate, and the substrate on which they are formed will be defined as a “TFT substrate 320”. The data line and the gate line are connected to a driving module for applying a signal for operating the thin film transistor, so that power of a desired size is applied to each pixel electrode.

On the other hand, the TFT substrate 320 is bonded in a state in which a substrate called "color filter substrate 310" is aligned in one embodiment. The TFT substrate 320 and the color filter substrate 310 are assembled to form a liquid crystal display panel 330.

The color filter substrate 310 includes an RGB pixel formed in the same pattern as the pattern of the pixel electrode formed on the TFT substrate 320 and a common electrode formed on the upper surface of the RGB pixel to which reference power is always applied. Of course, both the RGB pixel and the common electrode are formed on a transparent substrate.

Thereafter, a liquid crystal (not shown) is injected between the color filter substrate 310 and the TFT substrate 320 to complete the liquid crystal display panel assembly 300.                     

That is, the driving module applies the turn-on power to the first gate line while sequentially applying all the powers specified in the last data line from the first data line. As a result, all of the thin film transistors connected to the first gate line are turned on and the power applied to all the data lines is directly applied to the pixel electrode.

When the power level is changed in the pixel electrode, an electric field is formed between the common electrode and the pixel electrode. As a result, the arrangement of liquid crystals positioned between the pixel electrode and the common electrode is changed.

This process is repeated from the first gate line to the last gate line to form an image for a very short time, and a still image or a moving image is realized while continuously repeating it.

However, the liquid crystal display panel assembly alone is difficult to form a normal screen. This is because the liquid crystal is a light receiving element that does not emit light by itself. As a result, light is required to perform normal display in the liquid crystal display.

In this case, it is important to precisely control the liquid crystal in the liquid crystal display panel assembly 300, but it is also very important to generate light for display. If the optical distribution of light required for the display is nonuniform, no matter how excellent the performance of the liquid crystal display panel assembly 300 is, a normal display is impossible.

This important role is played by the "backlight assembly" introduced earlier.                     

The backlight assembly 200 basically includes the lamp assembly 125 and the light guide plate 110. In addition, a plurality of optical sheets 150, 160, 130, and a storage container 140 may be further formed in the backlight assembly 200 to realize the best optical distribution.

In this case, since the display is performed in units of planes in the liquid crystal display panel assembly 300, the light source should also ensure uniform luminance over the entire surface of the liquid crystal display panel.

However, it is difficult to implement a light source having a surface light source optical distribution except for actual sunlight, and even if practical, volume and weight are a problem. For this reason, in recent years, a point light source such as an LED or a line light source such as a cold cathode ray tube lamp is used.

However, the linear light sources or the point light sources have a problem in that the brightness is closer to the light source and the brightness decreases away from the light source. That is, line light sources or point light sources have a serious brightness unevenness problem. In addition, when the line light source or the point light source is positioned directly under the liquid crystal display panel assembly, there is a problem in that the volume is greatly increased.

In order to overcome these problems, the lamp assembly 125 is positioned at a side portion of the liquid crystal display panel assembly 300 instead of directly below it. In detail, the lamp assembly 125 includes a cold cathode ray tube type lamp 100 and a reflector 120 which emits light generated radially from the cold cathode ray tube type lamp 100 in only one direction.

In this case, the light guide plate 110 is coupled to the reflector 120 of the lamp assembly 125 to overcome the luminance non-uniformity of the lamp assembly 125.

The light guide plate 110 is manufactured in a wedge type or a flat plate type and has a rectangular parallelepiped shape as shown in FIG. 3.

The light guide plate 110 not only makes the uneven brightness of the lamp 100 uniform, but also serves to change the direction of light generated from the lamp 100 toward the liquid crystal display panel assembly 300. In addition, the light guide plate 110 may improve the luminance of the liquid crystal display panel 330 only when the light generated from the lamp 100 is supplied to the liquid crystal display panel 330 (see FIG. 10) without loss.

In this way, in order to make the luminance uniform and to improve the luminance, the light guide plate 110 is formed with, for example, a “luminance enhancement groove” as shown in FIG. 4.

Specifically, a side of the four side surfaces formed on the light guide plate 110 that faces the lamp 100 is defined as the “light incidence surface 114”, and two surfaces surrounded by the four side surfaces are defined as the “light reflecting surface 116. When defined as ") " and " light emitting surface 112 ", a plurality of brightness enhancing grooves 119 are formed in the light reflecting surface 116 as shown in FIG.

The plurality of brightness enhancement grooves 119 reflect light again, and are connected to the reflection surface 117 having the first inclination θ1 with respect to the light reflection surface 116 and the ends of the reflection surface 117 and reflect the light. And a non-reflective surface 118 having a second slope θ2 with respect to the light reflective surface 116.

In this case, as the total area of the reflective surface 117 in which the total surface area of each reflective surface 117 is added is larger, the luminance in the liquid crystal display device 600 is greatly improved.                     

In order to maximize the surface area of the reflective surface 117, the second slope of the non-reflective surface 118 is at least a first slope when the height of the brightness enhancement groove 119 is constant as h as shown in FIG. 4. By adjusting to be larger and vertically, the luminance may be improved by increasing the number of the brightness enhancing grooves 119 and increasing the surface area.

As such, the shape of the brightness enhancement groove 119 capable of achieving the luminance improvement may be a cone shape partially cut as shown in FIG. 5 or 6, a polygonal shape partially cut as shown in FIG. 7 or 8, As shown in Fig. 9, the profile is a groove or the like having a sawtooth wave shape, and in addition, the shape of the brightness enhancement groove can be modified innumerably.

In this way, even if the shape of the brightness enhancement groove 119 is made innumerably, the second slope of the non-reflective surface 118 is larger than the first slope of the above-described minimum slope of the minimum reflective surface 117. If it satisfies the luminance improvement can be obtained.

Of course, the first slope of the reflective surface 117 should be such that the angle at which the surface area is maximized is selected.

Reference numeral 160 schematically illustrates a diffuser plate for changing the distribution of light reflected from the brightness enhancement groove 119 of the light guide plate 110 and exiting the light exit surface 112, and reference numeral 150 denotes an upper surface of the diffuser plate 160. Prismatic sheet formed in the to change the optical path of the light diffused from the diffusion plate 160, 130 is not reflected by the light reflecting surface 116 of the light guide plate 110 and leaked outside the light reflecting surface 116 It is a reflector to reproduce leakage light.

As described in detail above, the display can be performed at the maximum brightness by uniformly adjusting the optical distribution and changing the light direction, as well as forming an improved brightness enhancement groove on the light reflection surface of the light guide plate to enhance the brightness. Make display performance even better. As such, when the luminance is improved, the power consumption of the liquid crystal display device used as a display device of the portable information processing device may be greatly reduced.

In the detailed description of the present invention described above with reference to a preferred embodiment of the present invention, those skilled in the art or those skilled in the art having ordinary knowledge in the scope of the invention described in the claims to be described later It will be understood that various modifications and variations can be made in the present invention without departing from the scope of the present invention.

Claims (7)

a) a light incident surface on which light is incident, b) a bottom surface formed adjacent to the light incident surface to reflect the light, c) a light exit surface on which the light exits opposite to the bottom surface; d) a reflective groove surface facing the light incidence surface and having a first inclination with respect to the bottom surface to reflect the light toward the light exit surface, and connected to an end of the reflective groove surface and a second with respect to the bottom surface; Polygonal or semi-conical shaped brightness enhancement grooves having non-reflective groove surfaces formed to have a slope are formed, And the second inclination of the non-reflective groove surface is greater than the first inclination of the reflective groove surface. The luminance-enhanced light guide plate of claim 1, wherein a plurality of the luminance-enhanced grooves are formed, and another reflective groove surface is successively formed at an end portion of the non-reflective groove surface and the bottom surface. The brightness enhancing LGP of claim 1, wherein the second slope is 90 °. delete delete 2. The luminance of claim 1, wherein the luminance enhancement groove has a groove shape formed of the reflective groove surface having the first slope and the non-reflective groove surface having the second slope and having a second slope. Reinforced light guide plate. a) a light incident surface on which light is incident, b) a bottom surface formed to be adjacent to the light incident surface and reflecting the light, c) a light exit surface on which the light exits to face the bottom surface, d) the light A reflection groove surface facing the entrance surface and having a first slope with respect to the bottom surface to reflect the light toward the light exit surface, the ratio being connected to the end of the reflection groove surface and having a second slope with respect to the bottom surface; A luminance enhanced groove having a reflective groove surface is formed, wherein the second slope of the non-reflective groove surface makes the optical distribution of the luminance enhanced light guide plate greater than the first slope of the reflective groove surface and the light emitted from the luminance enhanced light guide plate uniform. A backlight assembly comprising an optical distribution changing means; And And a liquid crystal display panel assembly for precisely controlling the amount of light generated from the backlight assembly to display an image.

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